Well for DS the only recent ones I know of are Pokemon Mystery Dungeon and Children of Mana.
I put a LOT of hours into PMD so far, and while I love it, the game mechanics are pretty sparse since its an old formula.
Children of Mana has much more variety and complexity from just about every angle. PMD is a BIGGER grind tho, as some of the dungeons have 99 levels.
THe biggest dungeon in Children of Mana so far was like 12 I think> The floors are really big and take longer to clear than the floors in PMD. Plus PMD requires your character eats shit and that gets on my nerves.
On PSP I dunno what good dungeon crawlers there are. Untold Legends isnt bad but every aspect of it reeks of mediocrity. The dungeon siege game apparently sux too